BIZZYIZZY08

I need help finding a book I read a long time ago. I can't remember the name.
          
          Its about this girl who lives with her brother in they're apartment and there's this guy who goes to school with her. Basically he's a bad boy and he's in like some gang but is trying to get out of it. She gets caught in the middle. He wears like this sweatshirt most of the time I think or its a leather jacket. I wanna say his name is Xavier but I don't remember. HELP ME PLEASE. I can't stop thinking about it. 

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